Formula: (Mg,Fe)3B7O13Cl
Origin of name: for Lowell Trembath, Canadian mineralogist
Crystal system: hexagonal
Crystal class: 3m
Twinning:
Unit cell:
Colour: colourless, light blue
Diaphaneity: transparent
Luster: vitreous
Habit: rhombohedrons smaller than 2 mm
Hardness: 6 to 8 (estimated)
Specific gravity: 2.84 to 3.34
Cleavage: none
Tenacity:
Streak: white
Synonyms/varieties:
Comments:
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